A 200Ω resistor has a certain colour code. If one replaces the red colour by green in the code, the new resistance will be
A
500Ω
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B
400Ω
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C
300Ω
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D
100Ω
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Solution
The correct option is A500Ω Given, resistance R=200Ω=20×101Ω
So, Colour scheme will be red, black and brown.
Significant figure of red band is 2 and for green is 5 . When red (2) is replaced with green (5), new resistance will be, R′=50×101Ω=500Ω
Hence , option (D) is correct.